Functional Testing and Non-Functional Testing are two major types of software testing used to evaluate software quality. Functional testing verifies whether the application features work as expected, while non-functional testing checks performance, security, usability, and other quality attributes.
Functional Testing
Functional Testing is a type of software testing that verifies whether the features and functions of an application work according to the specified requirements. It focuses on validating inputs, outputs, and expected system behavior.
Example: In an e-commerce website, functional testing checks whether login, add-to-cart, and payment features work correctly.
Non-Functional Testing
Non-functional testing is a type of software testing that checks how well an application performs rather than what it does. It evaluates quality attributes such as performance, security, usability, reliability, and scalability.
Example: In an e-commerce website, non-functional testing checks whether the site loads quickly, handles many users at the same time, and keeps payment data secure.
Functional Testing Vs Non-Functional Testing
| Basis | Functional Testing | Non-Functional Testing |
|---|---|---|
| Meaning | Checks what the system does and verifies features according to requirements. | Checks how well the system performs in terms of quality attributes. |
| Focus | Functions, features, inputs, and outputs | Performance, security, usability, reliability, and scalability |
| Purpose | Ensures the software works correctly | Ensures the software performs efficiently and securely |
| Based On | Functional requirements | Non-functional requirements |
| Examples | Unit Testing, Integration Testing, System Testing, Regression Testing | Performance Testing, Load Testing, Stress Testing, Security Testing, Usability Testing |
| Result | Confirms that application features work correctly | Confirms that the application is stable, secure, and efficient |
